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A049572 Primes p such that x^40 = 2 has a solution mod p. 2
2, 7, 23, 47, 73, 79, 89, 103, 127, 151, 167, 199, 223, 233, 239, 257, 263, 337, 359, 367, 383, 431, 439, 463, 479, 487, 503, 599, 607, 647, 719, 727, 743, 823, 839, 863, 887, 911, 919, 937, 967, 983, 1039, 1063, 1087, 1103, 1217, 1223, 1249, 1279, 1289 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A059352 relative to A000040. - Vincenzo Librandi, Sep 14 2012

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..1000

Index entries for related sequences

MATHEMATICA

ok[p_]:= Reduce[Mod[x^40 - 2, p] == 0, x, Integers] =!= False; Select[Prime[Range[300]], ok] (* Vincenzo Librandi, Sep 14 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(1300) | exists(t){x : x in ResidueClassRing(p) | x^40 eq 2}]; // Vincenzo Librandi, Sep 14 2012

CROSSREFS

Cf. A000040, A059352.

Sequence in context: A049232 A100917 A049552 * A094786 A028871 A053705

Adjacent sequences:  A049569 A049570 A049571 * A049573 A049574 A049575

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified September 20 03:27 EDT 2020. Contains 337264 sequences. (Running on oeis4.)